Just got done earning my Dominion III's and affording my Theta's.
Finally settling back down into missions, and trying to figure out what is worth the time and energy for the reward.

Figured you guys would know better than I would, particularly what rewards are worth it in the long run.

What do you want? then look through the missions to see what delivers it

I am currently working through the lazuli chain to get two extra npc slots

If you don't have your hyperterraformered exotic then now's a good time to try and get one. I've had 2 TO troop Cariiers in the last week or two - that's more than in a a couple of months. I get 1.1k total resources from my 15x Massive exotic.

Any of the missions which transform planets is good. Doing the one for Irradiated planets at the moment. That can boost your 15x v.large toxic planets to `17x massive. It's a worthwile boost to production and should help fund those thetacrons.

The CTP mission which appears at rank 200 is pretty good too.